OJ-DRHX Constant speed Accurately Controlled Rotor Speed

The Constant speed variant is the new member of the DRHX family designed with simplicity in mind.

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DRHX-Constan speed (1-8Nm)
DRHX 1-8Nm

OJ-DRHXDesigned with simplicity in mind

New drive for rotary heat exchangers
The DRHX is the next generation drive for rotaryheat exchangers – based on all-new technology. The DRHX series covers the range from 1Nm to 14Nm with both RS-485 and analog control. You can even get a version with a 3×7-segment display.

An excellent new alternative to geared motors
DRHX is an advantageous new alternative to traditional geared motor solutions. In contrast to geared motors, which lose torque at low and high speed, the stepper motor provides even torque throughout the entire speed range. The linear stepper motor torque curve means that rotor speed can be accurately controlled throughout a much wider range. This enables energy-efficient heat recovery and more precise temperature control.

Sensorless rotation monitor
The DRHX is equipped with a sophisticated software that monitors the rotation of the rotor, which means that no physical/optical rotor guard is required (patent pending). Naturally, fewer components also means that you get easier installation.

Sensorless closed-loop control
Combining a high-torque stepper motor with closed-loop sensorless control brings you a unique new solution – and great efficiency: The drive uses the feedback signal from the motor to ensure that the motor gets exactly the level of current required to achieve the desired speed and torque.

Constant speed
The Constant speed variant is the new member of the DRHX family. It is designed with simplicity in mind. It is equipped with a two pole connector. As soon as these are short circuit the connected motor will accelerate to max. speed. When the short circuit is open again the motor will reduce the speed to stop and automatically perform an alarm reset.

Product features:

  • Stop or maximum speed
  • 4 speed settings via 2 DIP switches
  • One digital input for Start/Stop
  • Stepper motor solution
  • 230V AC single phase supply
  • UL 61800-5-1 recognized

Product Documents

Product Sheets
Product Sheet, OJ DRHX Constant Speed, German
File type/size:PDF ( 156.68 KB )
Product Sheet, OJ-DRHX-Constant-Speed, English
File type/size:PDF ( 158.29 KB )
Product Catalogue, HVAC Controls and Drives, 2023, English
File type/size:PDF ( 2.47 MB )
Instructions, OJ-DRHX-MRHX-Constant-Speed, English
File type/size:PDF ( 3.04 MB )
Instructions, OJ-DRHX-MRHX-Constant-Speed, German
File type/size:PDF ( 3.04 MB )
Tender Texts
Tender Text, OJ-DRHX German
File type/size:PDF ( 462.55 KB )
Tender Text, OJ-DRHX, English
File type/size:PDF ( 458.13 KB )
Environmental Declarations
Declaration on Environment and Materials, DRHX-1055/1220, 1-8 Nm, 2023-07
File type/size:PDF ( 217.58 KB )
DRHX-Constan speed (1-8Nm)

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